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Updated Directories and Files (markdown)

Chris Lu 2018-06-07 20:51:50 -07:00
parent 9ce0c8c72a
commit 8bfe42da4f
1 changed files with 6 additions and 2 deletions
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Directories-and-Files.md

@ -52,7 +52,7 @@ For reads:
2. Client Read File Chunks => Weed Volume Servers
For writes:
1. Client write to Filer
1. Client stream files to Filer
2. Filer uploads data to Weed Volume Servers, and break the large files into chunks.
3. Filer writes the metadata and chunk information into Filer database.
@ -64,6 +64,10 @@ For file listing under a particular directory, the listing is just a simple scan
For adding one file, the parent directories will be recursively created if not exists. And then the file entry will be created.
For file renaming, it is just O(1) operations, with deleting the old metadata and inserting the new metadata, without changing the actual file content on volume servers.
For directory renaming, it will be O(N) operations, with N as the number of files and folders underneath the to-be-renamed directory. This is because each of them will need to adjust the metadata. But still there are no change for the actual file content on volume servers.
### Comparing Storage Options
Here is a comparison of different filer store options.
@ -76,7 +80,7 @@ Here is a comparison of different filer store options.
### Extending Storage Options
For any new storage option, please check the FilerStore interface. It should be fairly straight forward to implement. Welcome to contribute back.
For any new storage option, please implement the FilerStore interface. It should be fairly straight forward to implement. Welcome to contribute back.
### Use Cases